BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



731 



dona intestinalis Continued . 



been recorded during the survey dredging, 

 though Vcrrill states that it occurs on dead 

 shells, etc., at a depth of 20 fathoms. 

 "Ripe" throughout May (Bumpus); in July 

 (F. W. Bancroft). Eggs were fertilized 

 throughout September, and as late as the 3d of 

 October, 1909, by Prof. T. H. Morgan. 



Family BOTRYLLID^E. 



Botryllus schlosseri (Pallas). 



Gould, 1870, p. 3 (no local records); Verrill and 

 Smith, 1873, p. 702, 375 (Botryllus gouldii); 

 Bumpus, iSgSb (Botrullus gouldii); Van 

 Name, 1910, p. 350. 



Woods Hole Harbor, on Revenue wharf, Eel 

 Pond, Waquoit Bay, Tarpaulin Cove, also 

 on floating eelgrass in the open Sound. Very 

 abundant locally, encrusting eelgrass, rock- 

 weed, wood work, and all sorts of objects in shal- 

 low water. Occasionally brought up in the 

 dredge, when coming from depths of 3 to 10 

 fathoms, though such specimens may have 

 actually been taken near the surface, or may 

 have been carried to the deeper waters by cur- 

 rents. Dredged near West Chop, at Penikese, 

 and near Quisset. Survey. 



Fish Hawk stations: 7525 bis (small colony on 

 Zostera), 7751 (2 large colonies). 



Phalarope stations: 73 (on Zostera), 116, 131 (i 

 colony). 



" Found breeding from the 6th to the end of July, 

 and almost all the older colonies contained 

 either large ova or embryos. ' ' Bumpus, citing 

 F. W. Bancroft. 



The color of this species is extremely variable, 

 so much so that Verrill distinguished nine dif- 

 ferent color varieties, though he did not make 

 it clear whether or not these were intended as 

 varieties in the taxonomic sense. Dr. Van 

 Name informs us that Prof. Verrill himself 

 attached very little importance to these "va- 

 rieties." 



Family PEROPHORID^E. 



Perophora uiridis Verrill. [Chart 193.] 



Verrill, 18713, p. 359 (sp. nov.); Verrill, 1872; 

 Verrill and Smith, 1873, p. 702, 388; Bum- 

 pus, iSgSb; Lefevre, 1898, p. 369; Van Name, 



1911, p. 357- 



Little Harbor, Vineyard Haven, and Edgartown, 

 on piles, abundant. Eastern half of Vineyard 



Perophora viridis Continued. 



Sound, common; not recorded from the west- 

 em half; two records for Buzzards Bay; 

 dredged at 4 to 15 fathoms, chiefly on gravelly 

 or stony bottoms, where it often occurred in 

 company with Styela partita and other ascid- 

 ians. Survey. 



Fish Hawk stations: 7524 (on Styela), 7525 bis, 

 7536 (abundant, attached to seaweed), 7537 

 (few), 7537 bis (i), 7538 bis (abundant), 7539, 

 7541 bis (few), 7548 (few clusters), 7553 bis 

 (very many), 7742, 7744 (little), 7745 (i small 

 bunch), 7746 (little), 7747 (much), 7748 

 (much), 7749 (much), 7751 (few), 7754 (much), 

 7755 (much), 7756 (much), 7757 (much), 7763 

 (few colonies), 7765 (little), 7773 (much), 7774 

 (few), 7775 (little). Supplementary station 

 (1909): 7672 (several large colonies). 



Phalarope stations: 62 (many), 63 (very abun- 

 dant), 69 (several masses), 73 abundant), 77 

 (few), 135 (abundant). 



Family 



Didemnum lutariiim Van Name. [Chart 194.] 

 Verrill, 1872 (Lcptoclinum albidum and L. lute- 

 olum); Verrill and Smith, 1873, p. 705, 706, 

 403, etc. ( Verrill 's local records for "Lepto- 

 clinum albidum" and " Leptoclinum luteolum" 

 refer to Didemnum lutarium, which was con- 

 fused by him with the more northern species) ; 

 Van Name, 1910, p. 371 (sp. nov.). 

 Occurrence pretty general throughout Buzzards 

 Bay and the eastern half of Vineyard Sound; 

 in the western half of the Sound its occurrence 

 seems to be limited to the inshore stations; 

 Crab Ledge ? a ; dredged in i to 15 or more 

 fathoms on all sorts of bottoms. Survey. 

 Recorded also from wharves at Woods Hole, 

 Vineyard Haven, and Edgartown, and from 

 drifted material on Nobska Beach. A very 

 common species, incrusting shells, stones, 

 algse, sponges, and frequently other ascidians, 

 such as Styela partita and Amaroucium. 

 "South of Cape Cod (including also the south 

 shore of the cape) it is the common, and in 

 most places the only, species of the genus. 

 Probably all the published records of L. 

 albidum and L. luteolum Verrill from that part 

 of the coast refer to it. . . . North of Cape Cod 

 this form is local and for the most part replaced 

 by Tetradidemnum albidum." Van Name. 



From what we know of the Crab Ledge fauna it seems possible that the specimens from this point (stations 7604 to 7609) 

 might have belonged to the northern species, Tetradideinnum albidum (Verrill). No material from these stations has been 

 examined by Dr. Van Name. 



